multitask RSA: prelim cross-run analysis
michael freund
2020-11-05
1 Notes
Data/sample/preproc
- UB55 sans 432332
- surface + fMRIprep
- schaefer 400-07
1st-Level GLM
- 1trpk, runwise GLMs, shifted events
Target TRs:
- Axcpt: 7, 8, 9
- Cuedts: 9, 10
- Stern: 11, 12
- Stroop: 2, 3, 4
GLM contrasts:
- Axcpt: \(\text{BY} - \text{BX}\)
- Cuedts: \((\text{InConSwitch} + \text{InConRepeat} - \text{ConSwitch} - \text{ConRepeat})/2\)
- Stern: \(\text{LL5RN} - \text{LL5NN}\)
- Stroop: \((\text{PC50InCon} + \text{biasInCon} - \text{PC50Con} - \text{biasCon})/2\)
RSA
Similarity measure:
- Standard, “vanilla” RSA was used. That is, not a “cross-validated” RSA (e.g., cv-Euclidean, cv-Mahalanobis; Wather et al. 2016).
- Similarity measure: standard linear correlation
- NOT cross-valdiated (e.g., not cv-Euclidean/Mahalanobis)
- NOT prewhitened
- however, conducted in BETWEEN-RUN and WITHIN-RUN manner.
2 Group-mean similarity matrices
2.1 full matrix (within and between runs)
2.2 between-run only
